We found one dictionary that defines the word volunteerist:

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1. volunteerist: Wiktionary

Definitions from Wiktionary (volunteerist) ▸ noun:  A proponent of volunteerism. ▸ Words similar to volunteerist ▸ Usage examples for volunteerist ▸ Idioms related to volunteerist ▸ Wikipedia articles (New!) ▸ Popular adjectives describing volunteerist ▸ Words that often appear near volunteerist ▸ Rhymes of volunteerist ▸ Invented words related to volunteerist